Sewing machine



SEWING- MACHINE Filed Aug. 25, 1952 4. Sheets-Sheet l Feb. 19, 1935- J. GOULDBOURN ET AL SEWING MACHINE Filed Aug. 25, 1932 4 Sheets-Sheet 2 Witness #6.

J. GOULDBOURN ET AL Feb. 19, 1935.

SEWING MACHINE Filed Aug. 23, 1932 4- Sheets-Sheet 3 r g "I Y ,991,45s SEWING MACHINE e e Joseph Gouldbourn and Thomas Aubrey Kestell,

Leicester, England, assignors to United Shoe Machinery Corpotatiujm-Paterson, N; J., a poration of New Jersey Q V 1' l e i V I Application August 23; 1932, Serial No. 630,044

H I In QreatBritain September29; 1931 7 15EQlaims. 01; 112 -38) This invention relates especially to sewing ma- Figure 7 is a front elevation of a second form chine shuttles and the driving. thereof and is par of ,shuttle and its driving means; I ticularly but by no means exclusively, concerned Figure 8 is a frontelevation on a reduced scale" withrotary shuttles ffor lockstitch shoe outsole of theshuttle shown inFigure 7 and means for sewingmachines, examples of which are dislimiting rotary movementof a bobbingcase ass0 5 closed ingthe U; ,S. patent to French and Meyer ciated therewithp V No; 473,870 granted April 26, 1892 and in the Figure 9 is a section on the line 99 ;inrFig-= specification-of British LettersPatent No.j23,478 ure 7; r V I g ,7 v of 1910; The present invention provides novel 4 Figure 10 is'aright-hand side elevation, partly 10 shuttle constructions which may conveniently be in section of the said second form of shuttle; 16 v incorporated in'a shoe outsole sewing machine in Figure ll is a side elevation, partly in section, conjunctionwith thread handling mechanism of mechanism for moving thesaid means for-lim such as is disclosed in the specification of Brititing rotary movement oi the bobbin case iIl tOQOI' 'ish Letters'Patent No 357,596 the complete speciout; of operative position;v-.' 1

" 1'5 fication of which was accepted September 28, Figure 12i11ustrates the parts shown invFigure 1931 and/or in conjunction witha rotary take-up 11 in'a different position; 1 1 r v mechanismjsuch as is disclosed in the specifica- Figure13 is-a front'elevation, partlyin gsection, V tions of applications for British Letters Patent of the :said bobbin case; 1 I i j Nos; 22,753and 35,037 of 1931, I I Figure 14 is a left-handsideelevation ofthe 2o vThepresent invention has-,among'its several said bobbinrcase; g 1 e objects to ensure in a machine of the kind de- 'Figure 15 is an elevation of the said bobbin scribed in said British specification No. 23,478/ 10 case 1 viewed 1 in the direction of thearrow. in an easy spreading of the loop of thread as it is Figure 13;:

passing along the beak oftheshuttle; afree pas- Figure 16 is a 'perspective viewof a portiorioi 1.3 sageof the loop round the'shuttle without twistcthe bobbin caseshown in Figures-13 l4 and 15, 26

35 ing ing the loop, an easy threading of thebobbincase illustrating the thread tensioning slide;

and uniform tensioning of the shuttle thread as "Figure 1 1s a tional Vi w f ab r ion f th it leaves the bobbin case without unduly flattenbobbincase, shown inFigure 4, taken along the ing the thread. I I line 17-- 17 of that figure; and e f l Ill: The above and other objects and the several fea- Figure 18 is a sectional viewtaken onthexline tures ofthe invention will-become apparentto 18-18 of Figure 17. H V l 1 those skilled in the art from aconsideration of The form of shuttle illustrated in Figures 1 to the following description g'iven by way of exam- 6 pf thedrawin s comp i s .a s ut e. a 1' ple and with reference to the accompanying draw- C mp of two pa s '2- and 3;,fixed together i r and having v formed between them an undercut In thedrawings; V V a V j guideway 4 which receives ,a flanged guide 5 Figure 1 is a frontelevation of one form of formed. on a plate 6 fixed to a shuttle-carrying shuttle, its driving means and a work support bracket-'Ifixed on the machine frame. ,The plate I and needle of an outsole shoe sewing machine .6 may, for'purposes of assembly be formed in 40 whiclnexcept as otherwise.indicated, will be asthree separate p -v e Shuttle asing 1 has 40 sumed to be generally as described in said Britformed on it a beak 8, part of which isformed on ish Specification No. 23,478 of1910; 7 each of'the parts 2 and3'of theshuttle casing 1 Fi ure '2 is a right-hand side elevation of-the and its tip-isso angled: '(asshown in Figure 2) shuttle mechanism and sewing machine parts that whenthe beak enters the loop ofheedle shown in Figure 1; a v threadits-edge 9, 9 and inner face10.(see Figure 45 Figure 3 is a section on the line 3-3 in Figure 1) are substantially parallel to "the length. of 1 showing a section of the shuttle casing and its thread'll extending from the hook of the needle 12 support; v I a g I to the thread lifter, a section of; which is shown Figure 4 is a ,rear elevation ofja bobbin case, at 113 and the'beak'engagesthe greater part of to associated with the form r shuttle shown in this lengthlof threadwhen it takes the lo'op of t Figures 1, 2,-and'3; V

needle thread from theneedle and thread lifter.

Figure 5 is ,a plan view 'of the bobbin case Byreason of this comparatively wide beak the shown in Figure 4; w f loop of needle thread slips readilyalongthebeak Figure 6 is a right-hand side elevation of said and is easily spreadsufliciently to allow theloop bobbin case; to pass, overthe shuttle casing. The wide beak may be much shorter than one which as commonly used comes to a sharp point and because of this shorter beak, time may be saved in passing the loop over the shuttle casing, which saved time may be used in allowing more time for other parts of the machine to operate in the working cycle of the machine. The passage of the loop of neefdle thread along the inner face of the beak down to its root 210 is ensured by the round end 116 of the plate 6 which, if the loop does not itself slip along the beak as the shuttle casing rotates, engages the loop and actually pushes it along the said inner face 10 of the beak. f

The shuttle casing l is driven by adriving member 13 extending froma disc 14 fixedto a gear 15 rotatably mounted in the bracket 7. The gear 15 is driven by a gear 16 having extending from it a shaft 17, rotatably mounted in the bracket 7, and having fixed to it a disc'l8 which has fixed in it a crank-pin 19. The crank pin 19 has pivoted on it one end of a link 20, the other end of which is pivoted on a crank-pin 21 fixed in a crank-arm 22. The crank-arm 22 has extending from it a shaft 23'rotatably mounted in the machine frame and driven in any suitable manner from the driving shaft of the machine. Theshaft 23 is driven at such a speed that the shuttle makes two revolutions in each cycle of the machine and the relatively offset shafts 1'7; 23 crank pins 19,21 and link are so arranged that the'speed of the shuttle casing 1 is increased as the loop of needle thread ispassed over the shuttle casing so that it then travels-at a speed equal to about three revolutions ofthe shuttle casing in each cycle of the' machine. The speeding up' of the shuttle casing as above describedensur'esa rapid passage of the needle thread over the shuttle casing, thereby allowing more time inthe' cycle of the machine for other parts to function and allows the speed of the machine tobe increased without unduly increasing'the shuttle speed (with consequent risk of wear) throughout the cycle. The slowing down of the shuttle-casing driving member 13 occurs after the needle loop has passed over the top of the shuttle casing and results in the shuttle casing l by reason of its momentum over-running the driving member until the bottom part or root 210 of the beak 8 engages the end 24 of the driving member 13 A gap is then momentarily left between the end 25 of the driving member 13 and the face 26 on the shuttle casing through which gap the needle loop passes quite freely as it is pulled down by the take-up of the machine. Y 7 j The bobbin case 30, shown in Figures 4; 5, and 6, has, formed in it a stem 31 on which the bobbin 3 2 is rotatably mounted. The bobbin case has in it a hole 33 through which the thread.

passes fromthe bobbin and'this holeis so positioned in the bobbin case as to give the best lead of the thread from the bobbin to the hole irrespective of whether the diameter of the coils of thread on the bobbin is large or small, 'or whether the thread is being drawn from one end or the other offthe bobbin.v Thebobbin thread passes from'the hole 33 along agroovefl34 formed in the bobbin case and in this groove is slidingly mounted a block'35 having projecting upwardly'from it a guide pin 36 which enters a guide recess 3'7 in the bobbin case. A spring 38 urges the block towards the bottom ofthe groove 34 and causes the blockto exert a tension on the bobbin thread. The groove 34'is only just large enough to receive thebobbin threadand between the inner end of the block 35 and the bottom of the groove 34 there is, in effect, formed a hole through which the thread passes and this hole prevents the thread from being unduly distorted by the pressure of the block 35. The pressure of the block 35 against the thread may be adjusted by moving the legs 39, 39 of the spring inwardly or outwardly in their holes 40, 40 in thebobbin case. The legs 39, 39 are slightly bent so that when pushed into the holes 40, 40 they bind on the sides of the holes and are thus held in adjusted position. After passing along the groove 34 the bobbin thread passes through a hole 41 in the bobbin case and emerges from the front wall 42 of the bobbin case. The bobbin case 30 is carried in a recess 43 .ir rthe shuttle casing 1 and is ro-tatably mounted on a pin 44 extending from the part 3 of the shuttle casing and entering a bore in the stem 31. The axis of the recess 43 and pin 44 is offset about three-thirty-seconds of an inch from the axis of the shuttle casing.

Rotary movement of the bobbin case 30 is limited by the engagement of aconical projection 45 on thebobbin case with one side or the other of a recess 46 in an arm 47 which is hired to a stud 48 pivoted in a lug 49 projecting from the bracket 7; Also fixed to the stud 48 is a hand lever 50 by which the arm 47 may be swung away from in front of'the shuttle casing to allow the bobbin case to be withdrawn. The rotation of the shuttle casing 1 tends,- through thefriction between the pin 44 and the stem 31 of the bobbin case 30, to rotate the bobbin case in the same direction as the shuttle. This tendency keeps the length of thread between the hole 41 in the bobbin case and thework more or less taut. This, owing to the friction device 35, in effect anchors that part of the bobbin case 30 in which is the hole 41 and as the shuttle casing 1 rotates, the projection 45 is, by reasonof the eccentricity of the pin 44,- moved in substantially an elliptical path. The arrangement is such that when the loop of needle thread is being pulled down past the projection 45; the projection is about midway between the sides of the recess 46 and the loop of needle thread has a perfectly clear passage between the projection 45 and arm 4'7. .When the stitch is being set and thread is being pulled from the bobbin; the projection 45 is pulled up by the pull on the shuttle thread against the upper side of the recess46. The lower wall of the recess 46 is not engaged by the projection 45 during rotation of the shuttle casing and only acts in generally positioning the bobbin casewhen the machine'is at rest or if the thread should break. The arm 4'7 has fixed to it a clip 51 behind which the loose end of the shuttle thread may be placed after a length of sewing hasbeen completed and the threads cutoff, and anchored while the first stitch or first few stitches of a'freshlength of sewing are made. An adjustable screw 52 is threaded throughthe arm' 47 and engages the plate 6 to position the arm 47 in relation to the projection 45, it being understood th tsui'table latchingmeans is provided for holding the arm 47 in adjusted position.

The said second form ofshuttle shown in Figures '7 to 16 of the accompanying drawings comprises a shuttle casing composedof two parts'fil and 62 fixed together and formed with an undercut guideway 63 between them, which receives a fianged guide 64 formed on a plate 65 fixed to a shuttle carrying bracket 66 fixed to the machine frame. The plate 65 may be made in three parts, for purposes of assembly, if desired. The shuttle casing 60 has formed on it a beak 67 ireely enters a recess in the shuttle casingfiO 67 part or which is'formedon am part 61 and '62.

The-beak 67-, -6'7is similar in shape and action in the loopof 1 needle thread from the needle-and the-threadlifter to'the beak 8 in the first form of shuttle described above; The

rounded end 68 of the plate likewiseensures that'the-loop of needle thread shall pass down the inner face 69 0i the beak to its root.

Theshuttleflcasing 60' is driven -by"a' driving member'"70 extending from a disc '71 formed on the-end of a shaft "72 rotatably mounted in the bracket-'66 andin the machine frame. The shaft 72 has -fixed on it towards its rear end a crankcycle of the machine and, the relatively offset" shafts 72, '78 crank pins 74, 76 and link are arranged-in a similar manner and for the same purpose as the corresponding parts in the first form or shuttle and its driving mechanism hereinbefore described.

The bobbin case80 of thesecond formvoi shuttle shown in Figuresliiyla and 15 has in ita stem 81 on'which the bobbin is rotatably mounted. The stem 81 and-recess in the'bobbin case areas in'the earlier describedconstruction, eccentric to the outer wall of the bobbin case so as to leaveia thickened wall at one side of the bobbin case; The thread from the ;b0bbin passes through a; hole 82 in the bobbin case and then round aorounded'corner 83 beneath a ledge 84 and along a groove185: Thegroove 85 leads to arhole86 in'a nose 8'7 formed on the bobbin case out of which the thread passes; The hole-82 is positioned in thebobbin" case 80"so as to give the best'lead'of the thread from 'thebobbin to the hole'irrespective. of whether ther'thread; is

beingdrawn fromone' endior-theother ofIthe bobbinor whether the" diameter of the thread .on'the bobbin. islarge or small and the rounded corner 83 and 'guideway provideapassage" for the thread which is as free as possible'fromsharp' bends. The .nose 8'1 delivers theithread beyond the path or movement of Vtheibeak 6'7, 6'7 of the shuttle and as close as 'is convenient to the'work.

The shuttle thread is thus wellacontrolled and 'thepossibility of the position of the shuttle thread passing between the shuttle and the work becoming caught by the beak or becoming cold if V the shuttle is heatedand awaxed thread isbeing usedr'iszminimized; o I .o 1;; q The-shuttle thread as itvpasses along thegroove SS-onthebobbin-case '80 is tensioned bythe end of :a slide 106, mountedin a guidewayformed' in theQbobbin case 80a :The end of the slide 1 06 where it engagesthe thread extends partly'over ,the thread andwith the groove .85' forms prace tic'ally a hole through which the thread passes. Thethread is in this way prevented from being unduly flattened by the-pressure of the slide 106. The slide-is urged towards the thread by a spring 107,. the legs ofiwhich enter holes 108., 108,:in' the case; The legs of the spring are curved slightly so that they tend-to bind in the holes and their position along the holes-may be varied to vary the pressureof the spring; Two other holes 109;

'109 are-provided so that a shorter and stiffer spring maybe used if desired;

I and-is mounted'on a pin 88 of comparatively small diameter extending from the inner face-of the 'part 62'of the shuttle casing. 60, is limited bya v shaped ridge '89(Figure 10) formed on a member90; whichV-shaped portion enters a V-shaped grooveLSl (Figures 13 and 15) formed inthe' front wall of the-bobbin casea80. The pin'88 is coaxial with the recess in the shuttle'casing and with'the 'axis of the shuttle casing. The member90 is fixed to an arm 111 fixed toashaft 92 r-otatably mounted in bearings 93; 93 on the shuttle carrying bracket'66'. Tha shaft'92 has; formed onfoneend'o'f itan arm'94' and almemb'er' 95 which are ofthe shapeiillustrated in, Figures 11 andlz; =Also'rotatably mounted inthe'shuttle carrying bracketfifi is a shaft 96 which has fixed on it' a handdever 97 by which it maybe rotated and 'alsohas'formed on it adisc98 having formed V in it a recess 99 (Figure-11) and having its periphery 100 slightly eccentric to, the .axis of the-shaftQfifi The disc 98 hasprojetztingiromit twopins 101=and 102. When the .parts are in the positionthey occupy in Figure 11; the mem-' ber 90 is held in its operative position by the en-' gagement-oi the eccentric :periphery100 ofcthe disc Q'SWith the arml94 which presses an adjust.- able 'scr'ew 103 threaded through a lug 104 projecting fromithe :arm lll'against the .plate 65;; If, from the position shown in Figure 11, the hand}.

lever 97' is swung in an anti-clockwise direction the lockingv action of the periphery 100 and arm 94 is first. released; then the: pin 101 engagesa" curved part 104: of the member '95 and through the member rotates thesh'aft 92 and-swings the member 90' upwardly away from the bobbin case 80. ZThepin- 101 rotates the member 9 5until the roundedgend 105'of thearm 94 and the recess 99in :the disc 98 engage and continue therotation of the shaft 92 until the hand lever 9'7, engages one ofthe bearings 93 when the parts are in'the position shown in Figure 12. In thispositionfthe member 90 is raised so that the bobbin case 30 can be withdrawn from the shuttle casing 60, and is held inthis position by the engagement ,of the arm 94 with the periphery of the disc,98;, Asthe hand-lever 97 is returned to the position shownin Figure'll the member 90 either the axis goi thepin 88 at substantially right answings down to its operative positionby itsown o gles vto the length of the groove andis, there- 7' fore, moving in the most favourable direction to separate the projection and groove if these are incontact; vThe friction between thepin 88 and the bore in; the bobbin case 80 tends to turn the bobbincase in an anti-clockwise direction (viewed from theiront) but this tendency isto a certain extent; overcome by the weight of the 'nose 87 and there is littleresistance to the passage of the needle thread between the projection 89 and groove91i, 1 g o M Fixed on .the member 9 0,is /a guard 110.. This guard is substantially of the-shape Show;

Figures 8 andlO and is arranged to guidethe loop of needle thread as it is pulled down after passing over the bobbin case towards the shuttle thread where it extends upwardly from the work and to prevent the loop of needle thread from being caught on a projecting portion of the work or, for instance, on a tack projecting from the work and being prevented thereby from being pulled into the work.

Having 'now particularly described the nature of the present invention, what is claimed is:

1. A lockstitch sewing" machine having, in

combination, a hook needle, a rotary shuttle having a wide loop taking beak formedwith a substantially. flat inner face inclined atanangle to the rotary axis of the shuttle and a loop spreader acting when a'loop .of thread is drawn through the work by the needle to separate one side of the-loop-irom the otherside and to position a portion of the thread in parallel relation to the saidinner face as the 'beakengages the thread.

2. A-lockstitch sewing machine having, in combination, a hook needle, a loop spreader acting when a loop of thread is drawn throughthe work by the needle to separate one side of the loop from the other side, and a rotary shuttle having a loop taking beak of such width at its end that e as the beak enters a loop of needle threadit guideway about its outer edge and a beak having a wide loop taking end, a part of the beak end being formed on either side of the guideway.

4. A lockstitch sewing machine having, in combination, a hook needle, 2, loop spreader acting when a loop of thread is drawn through the work by the needle to separate one side of the loop from the other side, a shuttle comprising'a rotary shuttle casing formed in two parts fixed together, each part having formed on it a grooved portion comprising a circular guideway and a flanged circular shuttle guide in engagement with the guideway.

5. A lockstitch'sewing machine having, in combination, a hook needle, a loop spreader acting when a loop of thread is drawn through the work by the needle to separate one side 'of the loop from the other side, a shuttle compriisng s. rotary shuttle'casing formed with a circular guideway about its outer edge and a beak having a wide loop taking edge, a part of the beak edge being formed on eitherside of the guideway and acircular shuttle guide engaging the guideway, formed with a portion at one end for pushing. the loop of thread away from the edge of the beak towards the center of the shuttle as the shuttle casing revolves. j

v G. A lockstitch sewing machine having in combination, stitch-forming devices including a hook needle and a rotary shuttle having a loop taking beak, a thread case mounted in theshuttle to turn about an axis eccentric to the center of shuttle rotation, said thread case having a thread passage at one side of the thread case axis, 'friction means for resisting withdrawal of shuttle thread from the thread case, a stationary stop for preventing rotation of'the' thread case, the arrangement of the thread case and the shuttle beak being such that the thread case will be ro-. tated away from the stationary stop asthe needle thread passes between thertwodue to increasing tension on the shuttle thread extendingbetween the thread case and'the work. i l 7.- A lockstitch sewing machine having, in combination,,stitchforming devices including a hook needle, a rotary shuttle havingv a loop taking beak, a thread case mounted in. the shuttle to turn relatively to the shuttle, and means for maintaining the thread, case against turning movement comprising inter-engaging portions on the thread case and a stationary part in the form of a groove and a cooperating ridge, so arranged that when a loop of needle thread is being passed over the thread case the length of thread passing between the groove and ridgeportions moves in a direction substantially at right angles tothe length of the groove portion. 8. A lockstitch sewing machine having, in combination, stitch forming devices including a hook needle, a rotary shuttle, having a loop taking beak, ,a thread case mounted in the shuttle to. turn relatively to the shuttle, and meansfor maintaining the thread case against turning movement comprising a radial groove portion in the thread case and a cooperating ridge portion on a stationary part, so arranged that when a loopof needle thread is beingpassed over the thread case the length of thread passing between the grooveand ridge portions-moves in a di-,- rection substantiallyat right angles to the length or the groove portion. I 1

9. A lockstitch sewing machine having, in combination, stitch forming devices including a hook needle, a rotary shuttle having aloop taking beak, a thread case mountedin the shuttle and formed with an elongated nose which engages and delivers the shuttle thread beyond the path of movement of the shuttle beak. g

. 10. A lockstitch sewing machine having, in combinationQstitch" forming devices including a hook needle, a rotary-shuttle having a; loop taking beak, a thread case mounted in the shuttle having a passage for-conducting thread toward the work and a movable thread tension member in the passage forming with the casing substantially a hole through which the. thread passes. 11. A lockstitch sewing machine having; in combination, stitch. forming devices includinga hook needle, arotary shuttle having a loop taking beak, a thread case mounted in the shuttle, and a guard for directing the loop of needle thread to the shuttle threadwherei it extends from the work to the thread case;

12..A' lockstitchxsewing machine having, in combination, stitch forming devices including a hookneedle, a rotary shuttle having a loop taking beak, a thread case mountedin the shuttle, and means loosely engaging the shuttle for drivinglit at a high speed while the beak of the'shutr tlecarries the needle thread and at aco'mpara tively low speed inthe same direction during the remaining part of its movement, 'the, needle thread being passed betweenthe driving means and theshuttle at the time in which the driving means is slowing down from high to 'low speeds to permit the shuttle to run aheadof the driving means and provide a clearance space therebetween. V

' 13. A lockstitch sewing machine having, in combination, stitch-forming devices including a hook needle, a rotary shuttle having a recess at one side and a loop taking beak extending from one end 'of the recess,'a thread case mounted inrthe shuttle, and means loosely engaging the shuttle within said recess for driving it at a high speed while the beak of the shuttle carries the needle thread and at a comparatively low speed in the same direction during the remaining part of its complete cycle of movement, the needle thread being passed between the beak end of the shuttle recess and the driving means at the time in which the driving means increases its move- 'ment from low tov high speeds and the thread hook needle, a rotary shuttle, a thread case mounted in the shuttle and a thread tension in thethread case comprising a friction member movable against the thread and a U-shaped spring element, the U-part of which is bent out of the plane of the ends and engages the threadtension member to move it against the thread, said ends being slidably disposed in holes formed in the thread case substantially parallel to the direction of movement of the tensionmember' and maintained adjustably in position; therein by frictional engagement.

15. A lockstitch sewing machine having, in"

combination, stitch forming devices including a hook needle, a rotary shuttle, a thread case mounted in the shuttle, a guard pivotally mounted on a stationary part of the machine and a pivoted handle movable continuously through an arc about its pivot for unlocking the guard from either operative or, inoperative positions and moving the guard to the otherof said positions and looking it in saidother position. JOSEPH GOULDBOURN.

THOMAS AUBREY KESTELL. 

